Carbon Steel C22.8 ISO Flange Certificate: ISO 9001:2008 Size : DN10-DN 3000 ... kinds of Pipe FittingsStandardASTM , ANSI, DIN, GB, JB/TWall ThincknessSCH20-SCH160MaterialQ235,20#,16Mn , ST45.8, 12CrMoV, 15CrMo , 1Cr13,1Cr18Ni9Ti, 0Cr19Ni9,00Cr19Ni11,00Cr17Ni12Mo2 ... requirements or normal deliveryAuthentification codeISO 9001:2008 Carbon Steel C22.8 ISO Flange